摘要
针对低双折射光纤双光束干涉型传感器两臂偏振态随机变化引起的信号衰落 ,介绍了一种新型的干涉型光纤传感器的消偏振衰落技术 .通过在 Michelson光纤干涉仪上加两个法拉第旋转镜以抵消偏振态的随机变化 ,可以使输出信号的可见度稳定为 1,并分析了瑞利散射对光纤干涉仪的影响 .
Interfemometric fiber optics sensors have great great interest for many applications because of their high sensitivity. However, sensors constructed of low-birefringence single mode optical fibers cannot avoid the signal fading induced by random fluctuations in the states of polarization (SOPs) of the interfering beams. The sensing signal will even completely vanish when the SOPs of the two beams become orthogonal. So the elimination of polarization-induced fading (PIF) is a key problem in their applications, and is even more severe for arrays because SOPs of each sensor's optical paths in the array changes independently. The polarization-insensitive fiber optic Michelson interferometric sensor configuration introduced is based on the use of birefringence compensation in a retraced fiber path using Faraday rotator mirror elements. Analysis of results of experiments shows that interferometer visibility of 1, and can be achieved by using this approach. A technique for the elimination of coherent Rayleigh backscatter effects is presented and demonstrated.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2002年第1期44-46,共3页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目 ( 6 970 2 0 0 3)
